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3D printed polylactic acid (PLA) filters reinforced with polysaccharide nanofibers for metal ions capture and microplastics separation from water
Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden; Wallenberg Wood Science Center, Teknikringen 56-58, 100 44, Stockholm, Sweden.
Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden.
Department of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 106 91, Stockholm, Sweden.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fiberprocesser.ORCID iD: 0000-0002-7800-0559
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2023 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 457, article id 141153Article in journal (Refereed) Published
Abstract [en]

The need for multifunctional, robust, reusable, and high-flux filters is a constant challenge for sustainable water treatment. In this work, fully biobased and biodegradable water purification filters were developed and processed by the means of three-dimensional (3D) printing, more specifically by fused deposition modelling (FDM). The polylactic acid (PLA) – based composites reinforced with homogenously dispersed TEMPO-oxidized cellulose nanofibers (TCNF) or chitin nanofibers (ChNF) were prepared within a four-step process; i. melt blending, ii. thermally induced phase separation (TIPS) pelletization method, iii. freeze drying and iv. single-screw extrusion to 3D printing filaments. The monolithic, biocomposite filters were 3D printed in cylindrical as well as hourglass geometries with varying, multiscale pore architectures. The filters were designed to control the contact time between filter's active surfaces and contaminants, tailoring their permeance. All printed filters exhibited high print quality and high water throughput as well as enhanced mechanical properties, compared to pristine PLA filters. The improved toughness values of the biocomposite filters clearly indicate the reinforcing effect of the homogenously dispersed nanofibers (NFs). The homogenous dispersion is attributed to the TIPS method. The NFs effect is also reflected in the adsorption capacity of the filters towards copper ions, which was shown to be as high as 234 and 208 mg/gNF for TCNF and ChNF reinforced filters, respectively, compared to just 4 mg/g for the pure PLA filters. Moreover, the biocomposite-based filters showed higher potential for removal of microplastics from laundry effluent water when compared to pure PLA filters with maximum separation efficiency of 54 % and 35 % for TCNF/PLA and ChNF/PLA filters, respectively compared to 26 % for pure PLA filters, all that while maintaining their high permeance. The combination of environmentally friendly materials with a cost and time-effective technology such as FDM allows the development of customized water filtration systems, which can be easily adapted in the areas most affected by the inaccessibility of clean water.

Place, publisher, year, edition, pages
Elsevier BV , 2023. Vol. 457, article id 141153
Keywords [en]
3D printing, Metal ion removal, Microplastics removal, Nanocellulose, Nanochitin, Polylactic acid
National Category
Chemical Engineering Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-330093DOI: 10.1016/j.cej.2022.141153ISI: 001032235500001Scopus ID: 2-s2.0-85145338384OAI: oai:DiVA.org:kth-330093DiVA, id: diva2:1775130
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-09-06Bibliographically approved

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Redlinger-Pohn, Jakob D.

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